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For the lemon pound cake:
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Preheat the oven to 325 degrees. Butter and dust with flour a 9-inch round cake pan (or I suppose a loaf pan would work, also). Sift together the flour, baking powder and salt; set aside.
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Place the butter in a large bowl and using an handheld or stand mixer, beat until soft. Add the sugar and beat until fluffy, 1 to 2 minutes. Add the eggs, one at a time, beating until incorporated and scraping down the sides of the bowl as necessary. Reduce the speed to low. Add the flour mixture to the creamed mixture, alternating with the buttermilk, beginning and ending with the flour. Beat until incorporated after each addition. Stir in the lemon zest and lemon juice.
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Pour the batter into the prepared pan; bake until a toothpick inserted in the center comes out clean, 50-60 minutes (perhaps longer for a deep loaf pan). Invert onto a wire rack and let cool completely.
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For the lemon curd:
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Strain the yolks and whole egg through a fine mesh strainer into a heavy medium saucepan (this took a bit of work - I pressed on the egg mixture with the back of a spoon, moving it around, until they moved through the strainer). Add the sugar and juice; whisk to combine.
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Cook over low heat, stirring constantly with a wooden spoon until the mixture thickens and coats the back of a spoon, 12-14 minutes. Transfer to a medium bowl and stir in the butter, one piece at a time, until fully incorporated. Stir in the lemon zest. Cover the surface with plastic wrap to prevent a skin forming and chill in an airtight container for up to 3 days.
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For the berry syrup:
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Combine the berries, sugar, cornstarch, and lemon juice in a saucepan over medium-high heat. Bring to a simmer and cook just until the berries begin to break down, about 3-4 minutes. Take the berries off the heat and let the mixture cool. This can be done a day in advance. Cover and refrigerate the berry syrup until ready to use.
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In a clean bowl, whip the cream with the powdered sugar and the vanilla until soft peaks form. Put the lemon curd into a second bowl and whisk in about 1/4 cup of the whipped cream to loosen it up a bit. Then gently fold in the rest of the cream. Cover and refrigerate if not using immediately.
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To assemble the trifle, spoon a layer of the cream into a large glass or trifle bowl. Add a layer of pound cake. You may need to break the pound cake slices into smaller pieces and jigsaw them together to fit. Then drizzle on about 1/3 of the berry syrup. Don't worry if it doesn't completely coat the pound cake - just drizzle it across and let the berries fall where they may. Spoon a layer of lemon cream over the top, smoothing to the sides. Repeat all the layers, 2 or 3 more times, depending on the size of the bowl, finishing with a layer of lemon cream. Cover and refrigerate until ready to serve. It is best to make this several hours before serving and refrigerate it.
